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In my opinion the most likely facts are these:
(1) 100% of UFOs ever seen by people have human, natural, or non-intelligent extra-terrestrial origins
(2) There are currently and/or have been intelligent alien civilizations elsewhere in the universe (and likely within our own Milky Way)
(3) We've never been visited by or communicated to by intelligent alien life due to space-time constraints, assuming a best case scenario of near speed of light travel.
With conservative estimates, certain models predict the existence of 6-7 intelligent alien civilizations within the Milky Way galaxy alone.
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